Mixed franking from 4 Din. With 16 Din. On properly franked airmail foreign countries R letter with advice of delivery to Sonneberg in Thuringia with postal stamp BEOGRAD 1 / 24 from 9.4.43 as well with censorship seal the international country letter test place Vienna and arrival postmark SONNEBERG (Thuringia) 1 from 15.4.43; the cover is at the lower margin cut in, attest Kleymann: "these franking combination is rare. The condition is perfect. "